I am old school. I just use GNU Tar with the Pax format and multiple external detachable encypted hard drives. Reason is it is simple and a well known tool that is very common with a standard archive format.
Free and Open Source Software
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
I use my own scripts with rsync
etc, I don't back up my OS itself since I have installing it automated with scripts as well. I just back up specific things I need with my scripts.
automated with scripts
would you like to share those or do you have references for creating such scripts? this is on my to do list since years but I always struggle where to begin with.
I use NixOS so all my system configuration is already saved in my NixOS configs, which I save on GitHub. For dotfiles that aren't managed by NixOS I use syncthing to sync them between my devices, but no real backup cause I can just remake them if I need to, and things like my Neovim and VSCode configs are managed by my NixOS configs so they're backed up as well.
You can take this to the extreme too by erasing your root partition each boot: https://grahamc.com/blog/erase-your-darlings/
Using that method you isolate all important state on the system for backup with zfs send.
I've used borg for a while and like it a lot. I would say your best option for pure linux is borg+borgmatic/vorta just because borg is battle-tested.
If you run any other OSs and don't mind a relative newcomer, I've found kopia to be easy to recommend to my windows friends. At this point kopia has been around long enough (~4 years of actual beta) that I think it's safe to trust its integrity with personal data. It has all the important features from borg in a cross-platform solution, so it's also a viable alternative for borg on linux if you don't like borg's frontends for whatever reason.
I'm currently using TimeShift to backup my desktop onto an external hard drive (the why is because of how simple it is to use) and I'll be making a copy of anything I upload to my jellyfin server onto the external hard drive as well. I hope to eventually have a dedicated backup server and have a duplicate of it at a friend's house for offside backup too